Lifshitz point in the three-dimensional magnetic phase diagram ofCoNb2O6
| Autor: | P. Burlet, Helmut Ehrenberg, Hartmut Fuess, C. Heid, Hans Weitzel |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Physical Review B. 62:12146-12155 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | Neutron-diffraction and magnetization experiments have been performed on a single crystal of ${\mathrm{CoNb}}_{2}{\mathrm{O}}_{6}$ with an external magnetic field applied along different directions within the $\mathrm{ac}$ plane. Intermediate magnetic phases with long periodicities along the b axis are observed. Exchange and crystal-field parameters in a proposed model are determined by fitting the magnetization curves, and the comparison between calculated and observed magnetic phase diagrams provides a severe test of the applied model. The behavior of the propagation vector ${(0,k}_{y},0)$ at a transition point from an incommensurate phase to a commensurate one in zero field and near a Lifshitz point with a magnetic field applied is discussed in the light of theoretical considerations on multicritical phenomena. |
| Databáze: | OpenAIRE |
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